The Sinking Room
Over the many years that the Disneyland Haunted Mansion has been open, there were several problems with maintenance that accumulated over the decades. When Haunted Mansion Holiday first debuted in 2001, many of the problems were looked over and fixed.
One such problem was a leaky gasket underneath the Stretch Rooms. Over the night, the Stretch Room would slowly stretch as it lost hydraulic pressure. By the time the morning came, the Stretch Room would either have to be raised or lowered depending on its starting position. This problem had been in existance since at least 1995 when this photo of the room being retouched was taken. The wall behind the Stretch Room ledge is clearly visible from the slow sinking due to periods of non-use during the rehab.
However, since the installation of Haunted Mansion Holiday the Stretch Room has been fixed and quietly awaits for unsuspecting mortals before it makes it descent.